/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.packager;

import org.jpos.iso.*;
import org.jpos.util.LogEvent;
import org.jpos.util.Logger;

import java.util.ArrayList;
import java.util.BitSet;
import java.util.List;
import java.util.Map;

/**
 * GenericSubFieldPackager
 * Used to pack composite SubFields from the GenericPackager
 *
 * @author Eoin Flood
 * @see GenericPackager
 * <p/>
 * This class is basically the same as Base1SubFieldPackager except that it extends
 * GenericPackager which means that parameters such as emitBitmap, maxvalidField and
 * bitmapField can be specified in the GenericPackager xml config file.
 */

public class GenericSubFieldPackager extends GenericPackager {
	public GenericSubFieldPackager() throws ISOException {
		super();
	}

	@Override
	public int unpack(ISOComponent m, byte[] b) throws ISOException {
		LogEvent evt = new LogEvent(this, "unpack");
		try {
			if (m.getComposite() != m)
				throw new ISOException("Can't call packager on non Composite");
			if (b.length == 0)
				return 0; // nothing to do
			if (logger != null)  // save a few CPU cycle if no logger available
				evt.addMessage(ISOUtil.hexString(b));

			int consumed = 0;
			ISOBitMap bitmap = new ISOBitMap(-1);

			BitSet bmap = null;
			int maxField = fld.length;
			if (emitBitMap()) {
				consumed += getBitMapfieldPackager().unpack(bitmap, b, consumed);
				bmap = (BitSet) bitmap.getValue();
				m.set(bitmap);
				maxField = bmap.size();
			}
			for (int i = getFirstField(); i < maxField && consumed < b.length; i++) {
				if ((bmap == null || bmap.get(i)) && i < fld.length && fld[i] != null) {
					ISOComponent c = fld[i].createComponent(i);
					consumed += fld[i].unpack(c, b, consumed);
					m.set(c);
				}
			}
			if (b.length != consumed) {
				evt.addMessage(
						"WARNING: unpack len=" + b.length + " consumed=" + consumed);
			}
			return consumed;
		} catch (ISOException e) {
			evt.addMessage(e);
			throw e;
		} catch (Exception e) {
			evt.addMessage(e);
			throw new ISOException(e);
		} finally {
			Logger.log(evt);
		}
	}

	/**
	 * Pack the subfield into a byte array
	 */

	public byte[] pack(ISOComponent m) throws ISOException {
		LogEvent evt = new LogEvent(this, "pack");
		try {
			ISOComponent c;
			List<byte[]> l = new ArrayList<byte[]>();
			Map fields = m.getChildren();
			int len = 0;

			if (emitBitMap()) {
				// BITMAP (-1 in HashTable)
				c = (ISOComponent) fields.get(-1);
				byte[] b = getBitMapfieldPackager().pack(c);
				len += b.length;
				l.add(b);
			}

			for (int i = getFirstField(); i <= m.getMaxField(); i++) {
				c = (ISOComponent) fields.get(i);
				if (c == null && !emitBitMap())
					c = new ISOField(i, "");
				if (c != null) {
					try {
						byte[] b = fld[i].pack(c);
						len += b.length;
						l.add(b);
					} catch (Exception e) {
						evt.addMessage("error packing subfield " + i);
						evt.addMessage(c);
						evt.addMessage(e);
						throw e;
					}
				}
			}
			int k = 0;
			byte[] d = new byte[len];
			for (byte[] b : l) {
				System.arraycopy(b, 0, d, k, b.length);
				k += b.length;
			}
			if (logger != null)  // save a few CPU cycle if no logger available
				evt.addMessage(ISOUtil.hexString(d));
			return d;
		} catch (ISOException e) {
			evt.addMessage(e);
			throw e;
		} catch (Exception e) {
			evt.addMessage(e);
			throw new ISOException(e);
		} finally {
			Logger.log(evt);
		}
	}
}


